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https://bugzilla.mozilla.org/show_bug.cgi?id=1158558
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  <title>Test for Bug 1158558</title>
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<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1158558">Mozilla Bug 1158558</a>
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<script type="application/javascript">

/** Test for Bug 1158558 **/

// Observers of cycle-collector-begin can be implemented in JS, and
// thus can end up starting an incremental GC while we're in the middle
// of a CC slice.

SimpleTest.waitForExplicitFinish();

var observer = {
  observe: function(subject, topic, data) {
    SpecialPowers.removeObserver(observer, "cycle-collector-begin");
    SpecialPowers.Cu.getJSTestingFunctions().startgc(1);

    ok(true, "Do something so the test harness doesn't get angry");

    SimpleTest.finish();
  }
};

SpecialPowers.addObserver(observer, "cycle-collector-begin", false);

SpecialPowers.Cu.forceCC();

</script>
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